Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Complete the campaign.
Shoot 100 missiles.
Change soldiers' rally point 200 times.
Snipe 50 enemies.
Drop 1.000 or more bomblets with the cluster bomb.
Defeat Moloch the Demon Overlord.
Defeat Lord Blackburn to avoid war between kingdoms.
Defeat Ulguk-Hai the Troll Warlord.
Discover the hidden monster under water.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Defeat 9 legions before they replicate.
Capture the attention of the mysterious crow.
Do not let The Kingpin escape.
Defeat Greenmuck and its minions.
Defeat Gul'Thak and its minions.
Earn 45 stars.
Defeat Sarelgaz and its minions.
Kill 15 Wererats before they sicken any soldier.
Find the 5 legendary lost ice-shrooms.
Defeat 10 Troll Pathfinders while they're treading on ice.
Help Fredo escape.
Find the elusive acorn.
Kill 10 or more sheep with your hands.
Recruit max elves at The Silveroak Outpost.
Find the ninja master rat.
Defeat Vez'nan.
Build 4 Tesla towers in any stage.
Train a hero up to max level.
Summon 5 rock elementals in any one stage.
Kill 50 enemies by poison damage.
Have a single barbarian kill 10 enemies.
Free the sasquatch on the Icewind Pass.
Catch a fish.
Train 1.00 soldiers.
Teleport 250 or more enemies.
Kill 300 enemies with electricity.
Hold 500 or more enemies with Wrath of the Forest.
Throw 500 or more axes.
Build all 8 towers specializations.
Have your soldiers regenerate a total of 50.000 life.
Polymorph 50 enemies into sheep.
Disintegrate 50 or more enemies.
Earn 30 stars.
Have your soldiers survive the explosion of 300 demons.
Have your Paladins perform 100 Holy Strikes.
Have your Paladins heal a total of 7.000 life.
Send 1.000 soldiers to their deaths.
Kill 10.000 enemies.
Defeat J.T.
Upgrade all basic tower types to level3.
Train a hero up to level 5.
Kill 100 enemies with meteor showers.
Sell 30 towers.
Build 150 towers.
Earn 15 stars.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Kill 2.500 enemies
Call a wave within 3 seconds of the icon showing up.
Build 100 towers.
Call 10 waves early.
Open 5 information cards.
Build 30 towers.
Sell 5 towers in a single mission.
Use Rain of Fire 5 times in a single stage.
Kill 500 enemies.
Call all waves early in a single mission.
Kill one enemy.
Complete all heroic stages.
Complete all iron stages.
Have your Elves deal 10000 points of damage.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.